Repeater cord-circuits



' '0. H. LOYNES AND A. F.- ROSE.

REPEATER CORD CIRCUIT S. APPLICATION FILED sPT.2a, 1919.

Patented Sept. 20,1921.

2 SHEETS-SHEET 1.

1-H 3 H 5m] f INVENTORS.

ATTORNEY 0. H. LOYNES AND A. F. ROSE.

REPEATER CORD CIRCUITS.

APPLICATION FILED S'EPT.23, 191 9. I 1,391,552. PatntedSept. 20, 1921.

2 SHEETS-:SHEET 2.

AT ORNEXI OWEN H. LOYNES,

NEW YORK, ASSIGNORS TO TION OF NEW YORK.

BRIGHTON,

COMPANY, A conona T 0 all w hem it may concern.

Be it known that we, OWEN RIEPEATER CORD-CIRCUITS.

Specification of Letters Patent.

Application filed September 23, 1919.

H. LoYNns and ARTHUR F. Rosa, residing at Woodridge and New Brighton, inthe counties of Bergen and 5 Richmond, and States of New Jersey and NewYork, respectively,

have invented certain Improvements in Repeater Cord-Circuits, of whichtion.

terns 2 and i more visory signahn the following is a specifica- Thisinvention relates to telephone sys' particularly to the supergarrangements associated with repeater cordcircuits employed in suchsystems.

It is'one of the purposes of the invention to provide a repeater cordcircuit which may be connected either with long distance lines or withtoll switching trunks and thereby provide a cord at one end of a longsome intermediatepoint in a connection. further purpose is to providesupervisory signaling apparatus circuit which may be used for a repeatercord circuit of this type which will operate satisfactorily for bothkinds of connections and furthermore which'will cause no appreciabledisturbance in the condition-of balance existing between the repeaterapparatus and the cord and thebalancing artificial line associated withtion ismade.

the line Other and further features 0 with which a connectheinventionwilla appear more fully from the detailed descriptionhereinafter given.

When the repeater cord circuit of this invention is associated with atoll switching trunk, relay means controlled by a circuit completed tovground over the sleeve of the network jack associated with the toolswltching trunk are operated and completea direct current bridge acrossof the cord clrcuit.

the talking conductors By means of this direct current bridge thesupervisory signaling apparatusin the ,cord may-be controlled by the 1battery which is talking conductors of the switching trunk and which isdisconnected therefrom when the subscriber answers.

the sleeve circuit serves to operate additional relay means equal tothat whereby across the network conductors of the cor circuit, thisnetwork of the a network is bridged havingan impedance direct currentbridge completed across the talking conductors and thereby prevent ingthecondition of balance 0}? WOODBIDGE, NEW JERSEY,

the network jack visory signaling distance call as well as at U A longdistance line.

f J 2 of the incoming end of a going end of a long normally applied tothe At' the same time 'with the plug current bridge AND ARTHUR nnosn, ornew AMERICAN .rnnnrnoun AND TELEGRAPH P ten ed Sept. 20, 1921. Serialno, 325,761. 1

existing in the repeater set from being disturbed by the includingin:the talking circuit of thedirect current supervisory bridge; .Theabove described supervisory signaling the talking conductors of suchaline and disconnected therefrom upon the response of Accordingly thesleeve of associated with a long distance line is constructed without aconnection to grou'ndand when the repeater cord the subscriber.

circuit is connected with such a line the above mentioned supervisorysignaling apparatus will not. operate. The cord circuit repeateraccordingly 18 provided with theusual superate when a connection isestablished with a The invention may be more fully understood from the.following description taken in connection with the accompanying drawing,in theFigures '1 and 2 of which is illustrated' a circuit diagramembodyinga preferred form of theinvention.

In Fig. 2 is illustrated a repeater cord circuit terminating in Fig. land P. Associated with plug P is the jack 7 long distance line L3.'Onlya portion of the line L essential for van understanding of thisinvention is illustrated. end of line L is the network N adapted tobalance theline L Associated with the plugP are the jacks'J and JAssociated with jack J 3 is shown a portion of anoutdistance line L andthe balancing network N for said line. Associated with jack J is a tollswitching trunk 1 and the network N for balancing said toll switchingtrunk. The toll switching trunk l'terminates in plug P A subscriberssubstation 2 is-illustrated, terminating in the 'ack J 4 which isadapted to co -act with plug d lays 9 and 10 will be operated. The relay9 completes a direct current bridge 12 across the talking conductors PControlled by the direct arrangements which oper- 4 and 5 associated Vis the relay 1 1, which in turn" in the plugs v P,

Associated with the incoming.

controls the supervisory signal 13. The operation of relay serves tocomplete across the networks conductors 6 and 7 or plug P, a bridgeincluding the supplementary network The network N has an impedanceapproximately equal to the impedance of the direct current bridge 12,and serves to prevent thecondition of balance in the repeater set frombeing disturbed when the bridge 12 is completed across the talkingconductors '4 and 5. In the repeater set is illustrated the usual typeof twoelement, two-way repeater comprising the vacuum bulb amphfiers Aand A although other types of re between two long distance beemployed ining; coils circuit: from ground, jack J sleeve contacts'of F plug "Ppeaters such asmechanical repeaters might place of the vacuum bulbelements A and Included in the repeater cord circuit are the ringingkeys K and K the key K whereby the operators supervisory apparatus maybe connected to the monitor- 14, 15, 16 and 17, and the splitting key Iwhereby the operator can talk in either direction. -When a connection isestablished between two long distance lines by therepeater cord circuit,the customary-supervisorysignaling apparatus is provided, comprising thesupervisory signal 28 and the relays 22, 23, 24, 25, 26 and 27, and theringing responsive relays-18 and 19.

The invention may be more fully understood from thefollowing descriptionof its operation. When a connection is established L and L by meansof a"repeater cord circuit, the plugs P andP are insertedin the jacks J andrespectively. The insertion of plug P, in'jack J closes the follow ngsleeve conductor of jack J and plug P conductor 3, winding of relay 22,to bat tery and ground; The closing of this circuit will operate relay22. The'insertion of in jack J will close. the following circuit: fromground, sleeve' conductor of jack J sleeve contacts of 7 P conductors 29and 30, winding of relay 23, tobattery and ground, The closingo'f thiscircuit will operate the relay 23'.- The operation of relays 22 and 23will close the following circuit: from ground, lower contact and V 132,33, armature and contactof relay '19,

armature of relay 22, conductors 31,

conductor '34, contact and armature of relay 18, conductor 35, windingof battery and ground. The closing of this circuit will operate therelay 25, which will pull up its armature and hold open at thecontactpoint 36, a circuit which would otherwise'have been completed for therelay 26, as will be pointed out 1ater,and thereby preventingthesupervisory signal lamp 28' from being operated. Whenever forsupervisory purposes during the'conversation or at the end of aconversation ringingcurrent from one of the long distance 111165 istransmltted and lines-such as lines d t r 32 and 31,

jack J fftndplug relay 25, to

back over the talking conductors 'of such a line this ringing currentwill operate either of the ringing which are bridged gization of relay25 groundwill be applied contact point 36,

from conductor 33 over armature of relay 25, winding of relay 26, tobattery and ground. The closing of this circuit will operate relayeration of relay 26 ground willbe applied from conductor 33 over thecontactan'd armature of relay 26, over conductor 37, windingof relay 24,to battery and ground. The closing of this circuit will operate relay 24which will pull up its armatures and close the following circuit: fromground, lower armature and contact of relay24, conductor 38,*filament ofsignal lamp 28, to battery ground. The closing of this circuit willoperate the supervisory lamp 28 and thereby indicate that signalingcurrent is being 26. Upon the optransmitted over one of thelong'distance armature of relay 24, conductor 39, contact of key K,,conductor 40, conductor 41, con-' relay 22, to ground. 9 If aconnection is long distance line L trunk 1 by. means of the repeatercord cirestablished between the and the toll switching armature andcontact of cuit the plugs P and P, will be inserted in U the jacks Jand' J respectively. The su- V pervis'ory signaling arrangementscontrolling. the signal lamp 28 will operatein'the aspreviouslydescribed, and the s1gnal1a np'28 will be controlled by ring 111;;current transmitted over line L and through the winding' of the ringingrespon sive' relay 19 in thesame manner as previously pointed out.When'the-plug P iisinsorted in the -jack J, the following circuit isclosed. From ground, sleeve'conductor of network jack J sleeve contactsof-network jack J, and plug 42, winding of 11 s P conductor-8, conductorrelay 9, to, battery and.

grouncl;'and also from. conductor 8, over. con} 7 ductor 43, winding ofrelay 10, to battery and ground.

The closing of these circuits will operate relays 9 and 10. Theoperation 1 of relay 9 will complete a direct current bridge'12 acrossthe talkingconductors-44 and- 45 of the repeater cord circuit. -'Thisdirect current bridge includes the winding out-"relay 1 1. f W with thetollswitching trunk 1 hen a connection is made by inserting the plug Pin the 'jackJ, and'before the subscriber at substation 2 has removed thereceiver from' the switch hook battery is of trunk 1 J ring energizedover be closed normally applied to the talking conductors of the tollswitching trunk and the repeater cord circuit over the followingcircuit: from ground, lower winding of relay 46, lower contact of relay47, hand winding of transformer 49, tip conductor of trunk 1, tipcontacts of jack J and lug P conductor 4, normal contact of keyconductor 45, armature and make contact of relay 9, direct currentbridge 12, make contact and armature of relay 9, conductor 44, normalcontact of key K conductor 5, ring contacts of plug P and jack conductorof trunk 1, lower lefthand winding of transformer 49, conductor 50,upper contact and armature of relay 47, upper winding of relay 46, tobattery and ground. As the winding of relay 11 is included in the directcurrent bridge 12 of the circuit just traced, the relay 11 will beiop-'erated and will close the circuit for and operate the supervisory lamp13. Upon the completion of the previously traced circuit, the relay 46will also be operated. the operator hrows the ringing key K the cordringing current transmitted over the talking conductors will operaterelay 51. The operation of relay 51 closes the following circuit: fromground, armatureand contact of rela 51, conductor 53, winding 0 relay54, conductor 55, winding of relay 47, to battery and ground; -Theclosing .of this circuit operates the relay 54 which applies ringingcurrent to the talking conductors of trunk 1 and to the signalingapparatus at the substation 2. The closing of the above circuit alsooperates relay 47 When relay 47 is operated, the relay 46 will stillremain the following circuit: from lower winding of relay 46, lowercontact and armature of relay 4 to battery and round. Accordingly whenthe aforementioned circuit for relay 46 is opened by the ringing key K,or by the operation of relay 47, the relay 46 will not be deenergized,but will remain operative. When the subscriber at substation 2 inresponse to the ringing signal removes the receiver from the switchhook, the following circuit will be completed: from ground and battery,winding of relay 52, out over the ring conductors ground,

tion 2, through the substation apparatus and back over the tip conductorleading from substation 2 and over the tip conductor of trunk 1, toground. The closing of this circuit will operate relay 52. Upon theoperation of relay 52 the following circuit will from ground andbattery, lower winding of relay 47, conductors 55 and 56, contact andarmature of relay 52, conductor 57, upper winding of relay 47, conductor58, contact and armature of relay 46 to ground. The closing of thiscircuit will operate relay 47 which will pull up its armaturesanconductor 48, upper left-- When the ack such as the Jack tanoe line L asthe sleeve of thenetwork ingly the supervisory and the line leading tosubsta-p trunk, means thereby disconnect battery from the talk- 7 ingconductors of trunk 1, and accordingly from conductors 4 and 5. Thedisconnection of battery from this circuit will denergize relay 11,which was included therein, and-accordingly will allow the signal lamp13 to be extinguished. When the connection is completed and thesubscriber at substation 2 restores the receiver to the switch hook therelay 52 is deenergized and causes the deen-- ergization ofrelay 47.tion of relay 47 battery is again applied to the talking conductors oftrunk 1 and conductors 4 and 5, and the relay 11 is energized, therebyoperating the signal lamp 13 and indicating that the connection has beenterminated.

It is pointed out out that the completion of the direct current bridge12 across the talking conductors 4 and 5 and 44 and'45 of the repeatercord circuit would tend to disturb the condition of balance existing inthe repeater set between the trunk 1 and its balancing artificial line NAs has been formerly pointed out the relay 10 is provided which operateswhenever the relay 9 is operated, and which whenoperated serves tocomplete across the network conductors 6 and 7 a brid e including thenetwork N The network has an impedance equal to the impedance of thedirect current bridge 12 and accordingly serves to prevent anydisturbance in the condition of balance in the repeater set between thetrunk 1 and the net work N caused by the association therewith of thebridge 12. It is pointed out that the relays 9 and 10 and thesupervisory signaling apparatus associated therewith will not beoperated when the plug P is inserted in J, of a long dis- Upon thede'elnergizajack associated with such a line is not provided with aconnection to ground. Accordsignaling arrangements of the cord circuitsuitable for use in connection with a toll switching trunk remaininoperative when the cord circuit 1s associated with a long distanceline.

While the invention has been disclosed in certain specific arrangementswhich have been deemed desirable, it is understood that it is capable ofembodiment in many and widely varied forms without departing from thespirit of the invention as defined in the appended claims.

' What is claimed is:

1. In a telephonev system, a toll switching will trunk terminating at acentral office, a balancing network associated with said trunk, a sourceof battery supply normally connected to the talking conductors of saidtrunk, a subscribers line, associated with said controlled by saidsubscribers line. for disconnecting said battery supply d from saidtrunk, a cord circuit at said cen- V tral ofiice including repeaterapparatus and adapted for. establishing connections with said trunk,means controlled by the connection of said cord with said trunk for completing a direct current bridge across the talking conductors of saidcord, relay means in said bridge, supervisory signaling apparatuscontrolled by said relay, means CO1J- trolled by the connection of saidcord with said trunk for completing a bridge across the networkconductors of said cord, and means ior making the impedances of both ofsaid bridges approximately equal.

2. In a telephone system, a toll switching trunk terminating at acentral office, long distance lines terminating at said central oilice,balancing networks associated with said trunk and said lines, asource ofbattery supply normally connected to the talking conductorsof saidtrunk, a subscribers line associated with said trunk, means controlledby said subscribers line for disconnecting said battery supply from saidtrunk, a cord circuit at said central ofli 'ce including repeaterapparatus and adapted for establish-' mg connections between two of saidlong distance lines and between one of said long distance lines and saidtoll switching trunk, connection of said cord'with said trunk forcompleting a direct I 1 current bridge across the talking conductors ofsaid cord, relay said cord with said said trunk means in said bridges,supervisory signaling apparatus controlled by said relay, means matelyequal, additional supervisory signalmg apparatus included in said cordcircuit, and means controlled1 bythe connection of ong with one of saidlines and said trunk for rendering operative said additional supervisorysignaling apparatus.

3. In a telephone system, trunk circuit at said central office includingrepeater apparatus and adapted for establish ing connections with saidtrunk, means responsive to the connection of said cord with forcompleting a bridge across the talking conductors of completing a bridgeacross the network conductors of said'cord, supervisorysignalingapparatus controlled e, and animpedanceelement included 7 bridge equalto the, im-

' pedance of said first mentioned bridge.

In testimony whereof, We have signed our names tov this specificationSeptember 1919. q

' owEN H. LoYNEs. I

ARTHUR F. ROSE.

by said first mentionedv distance lines or I p a toll switchingtermlnatingat a central ofiice, a cord saidcord and for having an this19th day of i

